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" A pipe wrench is a hardy tool, not given to easy breakage like a thin saw or a drill bit. Heck, it&amp;#039;s a weapon in the game of Clue. But if you forget to leave a small space between the back of a wrench&amp;#039;s hook jaw and the pipe you&amp;#039;re gripping, you could strip the teeth, bend the jaw, or damage the tightening nut. A wrench&amp;#039;s jaws aren&amp;#039;t parallel, and their natural wedging action tightens around the pipe as you turn. &amp;quot;Leaving a space permits the jaws to tighten with just the right amount of give,&amp;quot; says Chuck Stephens, director of service and training for Ridgid tools, who has been using pipe wrenches professionally for thirty-seven years. If you forget the space, you could turn your best wrench into a decorative piece of cast iron, which is only a good thing if you&amp;#039;re a blacksmith. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/tools/a15200/the-right-way-to-use-a-pipe-wrench/>